[2] | 1 | """ |
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| 2 | Utility functions for bi-directional Python version compatibility. Python 2.5 |
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| 3 | introduced hashlib which replaced sha in Python 2.4 and previous versions. |
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| 4 | """ |
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| 5 | |
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| 6 | import sys, logging |
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| 7 | |
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| 8 | # Use hashlib module if for Python 2.5+, fall back on old sha and md5 modules |
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| 9 | # sha1 requires explicit calls to new if also being passed to hmac (!) |
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| 10 | try: |
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| 11 | import hashlib |
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| 12 | sha1 = hashlib.sha1 |
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| 13 | sha = sha1 |
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| 14 | md5 = hashlib.md5 |
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| 15 | except ImportError, e: |
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| 16 | from sha import new as sha1 |
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| 17 | import sha |
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| 18 | from md5 import new as md5 |
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| 19 | import hmac |
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| 20 | |
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| 21 | log = logging.getLogger( __name__ ) |
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| 22 | |
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| 23 | def new_secure_hash( text_type=None ): |
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| 24 | """ |
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| 25 | Returns either a sha1 hash object (if called with no arguments), or a |
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| 26 | hexdigest of the sha1 hash of the argument `text_type`. |
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| 27 | """ |
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| 28 | if text_type: |
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| 29 | return sha1( text_type ).hexdigest() |
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| 30 | else: |
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| 31 | return sha1() |
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| 32 | |
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| 33 | def hmac_new( key, value ): |
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| 34 | return hmac.new( key, value, sha ).hexdigest() |
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